diff --git a/tests/source/issue-3984/imports_granularity_crate.rs b/tests/source/issue-3984/imports_granularity_crate.rs
new file mode 100644
index 00000000000..e45cd5cbe0a
--- /dev/null
+++ b/tests/source/issue-3984/imports_granularity_crate.rs
@@ -0,0 +1,15 @@
+// rustfmt-imports_granularity: Crate
+
+// See https://github.com/rust-lang/rustfmt/issues/3984
+use a::{item /* comment */};
+use b::{
+    a,
+    // comment
+    item,
+};
+use c::item /* comment */;
+use d::item; // really long comment (with `use` exactly 100 characters) ____________________________
+
+use std::e::{/* it's a comment! */ bar /* and another */};
+use std::f::{/* it's a comment! */ bar};
+use std::g::{bar /* and another */};
diff --git a/tests/source/issue-3984/imports_granularity_item.rs b/tests/source/issue-3984/imports_granularity_item.rs
new file mode 100644
index 00000000000..4d950d5de4f
--- /dev/null
+++ b/tests/source/issue-3984/imports_granularity_item.rs
@@ -0,0 +1,15 @@
+// rustfmt-imports_granularity: Item
+
+// See https://github.com/rust-lang/rustfmt/issues/3984
+use a::{item /* comment */};
+use b::{
+    a,
+    // comment
+    item,
+};
+use c::item /* comment */;
+use d::item; // really long comment (with `use` exactly 100 characters) ____________________________
+
+use std::e::{/* it's a comment! */ bar /* and another */};
+use std::f::{/* it's a comment! */ bar};
+use std::g::{bar /* and another */};
diff --git a/tests/source/issue-3984/imports_granularity_module.rs b/tests/source/issue-3984/imports_granularity_module.rs
new file mode 100644
index 00000000000..0ec9f6b595b
--- /dev/null
+++ b/tests/source/issue-3984/imports_granularity_module.rs
@@ -0,0 +1,15 @@
+// rustfmt-imports_granularity: Module
+
+// See https://github.com/rust-lang/rustfmt/issues/3984
+use a::{item /* comment */};
+use b::{
+    a,
+    // comment
+    item,
+};
+use c::item /* comment */;
+use d::item; // really long comment (with `use` exactly 100 characters) ____________________________
+
+use std::e::{/* it's a comment! */ bar /* and another */};
+use std::f::{/* it's a comment! */ bar};
+use std::g::{bar /* and another */};
diff --git a/tests/source/issue-3984/imports_granularity_one.rs b/tests/source/issue-3984/imports_granularity_one.rs
new file mode 100644
index 00000000000..87c2997f886
--- /dev/null
+++ b/tests/source/issue-3984/imports_granularity_one.rs
@@ -0,0 +1,15 @@
+// rustfmt-imports_granularity: One
+
+// See https://github.com/rust-lang/rustfmt/issues/3984
+use a::{item /* comment */};
+use b::{
+    a,
+    // comment
+    item,
+};
+use c::item /* comment */;
+use d::item; // really long comment (with `use` exactly 100 characters) ____________________________
+
+use std::e::{/* it's a comment! */ bar /* and another */};
+use std::f::{/* it's a comment! */ bar};
+use std::g::{bar /* and another */};
diff --git a/tests/source/issue-3984/imports_granularity_preserve.rs b/tests/source/issue-3984/imports_granularity_preserve.rs
new file mode 100644
index 00000000000..4e51d186a94
--- /dev/null
+++ b/tests/source/issue-3984/imports_granularity_preserve.rs
@@ -0,0 +1,15 @@
+// rustfmt-imports_granularity: Preserve
+
+// See https://github.com/rust-lang/rustfmt/issues/3984
+use a::{item /* comment */};
+use b::{
+    a,
+    // comment
+    item,
+};
+use c::item /* comment */;
+use d::item; // really long comment (with `use` exactly 100 characters) ____________________________
+
+use std::e::{/* it's a comment! */ bar /* and another */};
+use std::f::{/* it's a comment! */ bar};
+use std::g::{bar /* and another */};
diff --git a/tests/target/issue-3984/imports_granularity_crate.rs b/tests/target/issue-3984/imports_granularity_crate.rs
new file mode 100644
index 00000000000..0dd087e322f
--- /dev/null
+++ b/tests/target/issue-3984/imports_granularity_crate.rs
@@ -0,0 +1,15 @@
+// rustfmt-imports_granularity: Crate
+
+// See https://github.com/rust-lang/rustfmt/issues/3984
+use a::{item /* comment */};
+use b::{
+    a,
+    // comment
+    item,
+};
+use c::item; /* comment */
+use d::item; // really long comment (with `use` exactly 100 characters) ____________________________
+
+use std::e::{/* it's a comment! */ bar /* and another */};
+use std::f::{/* it's a comment! */ bar};
+use std::g::{bar /* and another */};
diff --git a/tests/target/issue-3984/imports_granularity_item.rs b/tests/target/issue-3984/imports_granularity_item.rs
new file mode 100644
index 00000000000..a5f0f7dac86
--- /dev/null
+++ b/tests/target/issue-3984/imports_granularity_item.rs
@@ -0,0 +1,15 @@
+// rustfmt-imports_granularity: Item
+
+// See https://github.com/rust-lang/rustfmt/issues/3984
+use a::{item /* comment */};
+use b::{
+    a,
+    // comment
+    item,
+};
+use c::item; /* comment */
+use d::item; // really long comment (with `use` exactly 100 characters) ____________________________
+
+use std::e::{/* it's a comment! */ bar /* and another */};
+use std::f::{/* it's a comment! */ bar};
+use std::g::{bar /* and another */};
diff --git a/tests/target/issue-3984/imports_granularity_module.rs b/tests/target/issue-3984/imports_granularity_module.rs
new file mode 100644
index 00000000000..2ce31a0ee94
--- /dev/null
+++ b/tests/target/issue-3984/imports_granularity_module.rs
@@ -0,0 +1,15 @@
+// rustfmt-imports_granularity: Module
+
+// See https://github.com/rust-lang/rustfmt/issues/3984
+use a::{item /* comment */};
+use b::{
+    a,
+    // comment
+    item,
+};
+use c::item; /* comment */
+use d::item; // really long comment (with `use` exactly 100 characters) ____________________________
+
+use std::e::{/* it's a comment! */ bar /* and another */};
+use std::f::{/* it's a comment! */ bar};
+use std::g::{bar /* and another */};
diff --git a/tests/target/issue-3984/imports_granularity_one.rs b/tests/target/issue-3984/imports_granularity_one.rs
new file mode 100644
index 00000000000..ee7af1f045e
--- /dev/null
+++ b/tests/target/issue-3984/imports_granularity_one.rs
@@ -0,0 +1,15 @@
+// rustfmt-imports_granularity: One
+
+// See https://github.com/rust-lang/rustfmt/issues/3984
+use a::{item /* comment */};
+use b::{
+    a,
+    // comment
+    item,
+};
+use c::item; /* comment */
+use d::item; // really long comment (with `use` exactly 100 characters) ____________________________
+
+use std::e::{/* it's a comment! */ bar /* and another */};
+use std::f::{/* it's a comment! */ bar};
+use std::g::{bar /* and another */};
diff --git a/tests/target/issue-3984/imports_granularity_preserve.rs b/tests/target/issue-3984/imports_granularity_preserve.rs
new file mode 100644
index 00000000000..639c03f4980
--- /dev/null
+++ b/tests/target/issue-3984/imports_granularity_preserve.rs
@@ -0,0 +1,15 @@
+// rustfmt-imports_granularity: Preserve
+
+// See https://github.com/rust-lang/rustfmt/issues/3984
+use a::{item /* comment */};
+use b::{
+    a,
+    // comment
+    item,
+};
+use c::item; /* comment */
+use d::item; // really long comment (with `use` exactly 100 characters) ____________________________
+
+use std::e::{/* it's a comment! */ bar /* and another */};
+use std::f::{/* it's a comment! */ bar};
+use std::g::{bar /* and another */};